UniqueTogetherValidator fails validating conditional auto_now datetime constraint on 3.16.1

[julian-rachmann]

I have a model that defines a UniqueConstraint with a condition using a DateTime field with auto_now_add=True:

class UniqueConstraintWithDateTimeModel(models.Model):
    numbered = models.IntegerField()
    created = models.DateTime(auto_now_add=True)
    
    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=('numbered'),
                condition=models.Q(created__date__gte="2021-01-01"),
                name='unique_constraint_with_date_cond',
            ),
        ]

When validating the model using a ModelSerializer, the validation fails with {"created": ["This field is required."]} on create.

From what I can tell, the issue seems to be that enforce_required_fields on UniqueTogetherValidator is not taking into account any defaults that the model might be supplying.